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trOuBLEshOOtIng
sensors and LEDs
no Display or LED Lights
Check the power to the MC Elite. The MC Elite requires
120VAC power to the Black wires or 24VAC to the right-most
terminals. Turn the power off and back on to restore the
display. If unsuccessful, make sure that the control's Display
Cover is securely mounted to the Base.
system or Outdoor reads OpEn or shOrt
If the sensor reads Open, short the sensor input terminals. The
display should read Short. If it doesn't, the MC Elite may be
damaged. If it does read Short, either the sensor is damaged
or its wiring is not continuous. Check the sensor wiring.
If the sensor reads Short, remove the wires from the input
terminals. The display should read Open. If it doesn't read
Open, the MC Elite may be damaged. If it does read Open, the
sensor is damaged and needs to be replaced.
temperature sensor reads an Incorrect temperature
Remove the sensor wires from the input terminals. The display
should change to read Open. If it doesn't, the MC Elite may be
damaged. Take an ohm reading across the detached sensor
wires. The ohm reading should correspond to the Temperature
Sensor Chart. If the difference is within 5°F adjust the sensor
Trim. Otherwise, the sensor may be damaged.
system sensor reads an Incorrect pressure
First make sure that the pressure transducer installed matches
the Sensor Type selected from the Startup Menu. See "Sensor
Type" on page 11. Then check if the reading is a specified
amount above or below the actual pressure, adjust it using the
System Trim. If the reading is Short, remove the wires from the
sensor terminals. The display should change to read Open.
If it does not, the MC Elite may be damaged. Otherwise, if it
does, then the pressure transducer is damaged and needs to
be replaced.
no heat - All LEDs are OFF
Check the outdoor temperature and the outdoor Cutoff
readings. If the outdoor temperature is above the outdoor
Cutoff, the MC Elite will not give heat. See "Outdoor Cutoff"
on page 15. If the display shows TSTAT OPEN then, check
the EXT+ and EXT- terminals. If the terminals are not jumped
together, the MC Elite will not give heat. See "Wiring the
Enable/Disable" on page 7.
no heat - system LED is On
First, make sure that the system pump is running. Disconnect the MC Elite's Yellow wires. Then, test for continuity
across the Yellow wires. If the wires are continuous, the MC Elite is calling for the System Pump to run and the problem
is not with the MC Elite. Check the power source to the pump and the pump operation.
MC-Elite Installation and Operation Manual
pressure sensor Chart
0 - 30
Input
psI/hg
(in mA)
range
4
0
4.08
4.16
4.53
1
5.07
2
5.6
3
7.2
6
8.8
9
10.4
12
12
15
13.6
18
15.2
21
16.8
24
18.4
27
20
30
temperature sensor
Chart
tEMpErAturE
value
(in
Ohms)
°F
°C
OPEN
150000
-30
-34
117720
-20
-29
82823
-10
-23
59076
0
-18
42683
10
-12
31215
20
-7
23089
25
-4
19939
30
-1
17264
35
2
14985
40
4
13040
45
7
11374
50
10
9944
55
13
8714
60
16
7653
70
21
5941
80
27
4649
90
32
3667
0 - 100
0 - 200
0 - 300
psI/rh%
psI
psI
range
range
range
0
0
0
1
1
2
10
20
10
20
30
20
40
60
30
60
90
40
80
120
50
100
150
60
120
180
70
140
210
80
160
240
90
180
270
100
200
300
tEMpErAturE
value
(in
°F
°C
Ohms)
100
38
2914
110
43
2332
120
49
1879
130
54
1524
140
60
1243
150
66
1021
160
71
842
170
77
699
180
82
583
190
88
489
200
93
412
210
99
349
220
104
297
230
110
253
240
116
217
250
121
187
SHORT
100
19
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